Lamp



2 Sheets-Sheet l Feb. 21, 1939. .1, B; DlcKsoN LAMP Filed Feb. 8, 1937 Feb. 2l, 1939. J. B. DlcKsoN LAMP Filed Feb. '8, 193'. 2 sheets-sheet 2 (aas raz-5' INVENTOR 10H/v D/c/fo/v. BY

ATTORNEYS.

- ing of the light beam;

.for securely releas/ably holding a casing of this Patented Feb. 21, 1939 LAMP John B. Dickson, Huntington Woods,

lCorporation, Highland Park,

signor to Chrysler Mich., a corporation of Delaware February 8,

Application 1 Claim.

This invention relates to improvements in lamps. n

More particularly, the inventionpertains to improved adjustable light beam projecting lamps for vehicles.

` One of the main objects of the invention is to provide means for adjustably removably mounting in a lamp structure, an electric bulb unit of thetype which includes a permanently, hermetically sealed assembly comprising integrally associated unitary lens and reiiector portions having a filament enveloped therebetween.`

Further objects of the invention are to provide an improved casing for a lamp unit of the foregoing character which is ,adjustable from the exterior of the lamp structure in which it is mounted in order to facilitate convenient focusto provide improved means character and the lamp unit mounted therein, in a selected position of adjustment; and to provide releasable securing means of this kind which are accessible from the exterior of the lamp structure to accommodate focusing of the lamp without requiring disassembly thereof.

Still further objects of the invention are to provide a casing for the lamp unit assembly fromf which the lamp unit is conveniently removable;

to provide an assembly of this character in which the lamp unit is yieldably held in its normal position without endangering the glass portions thereof to chipping or fracture by glass engaging clamping or similar means; to provide an intertting lampcasing and bulb unit of the foregoing kind which, when in one relative angular position, are normally inseparable and which, when in another relative angular position, ac-

commodates removal of the bulbvunit from the casing; and to provide means for supporting a lamp bulb unit of this character independently of its terminal.

Illustrative embodiments of the invention are shown in the accompanying drawings, in which: Fig. 1 is a fragmentary vertical sectional view of a vehicle head lamp embodying the invention.

Fig. 2 is a fragmentary front elevational view of the lamp shown in Fig. 1. Fig. 3 is a horizontal sectional view taken on the une 3--3 of Fig. 1.

Fig. 4 is a fragmentary front elevational view.

, partly in section, showing a further development of the invention.

` In the form of the invention illustrated in Figs.

1 to 3, inclusive, the lamp comprises a housing structure I0, preferably comprising a die casties'z, seal No. 124.516

(Cl. Z-41.5)

ing which is securable to a portion of an automobile, generally designated by the numeral' II in Fig. l. The housing I0 has a generally circular opening I2 in its front side which is surrounded by a restricting lip` I3. Mounted in the opening I2 is a dome shaped casing I4, preferably formed of sheet metal. The front end portion of the casing I4 protrudes externally of the housing I0 and is provided w'th an opening I5 which is also of generally circular shape. A rounded flange I6, formed integrally on the casing I4, surrounds and constricts the opening I5 therein. The flange is preferably somewhat resiliently yieldable and deformable. Diametrically opposite portions of the flange II` are cut away, as illustrated at I1 in-Fig. 2, in order to increase the diameter of the opening throughout a limited extent thereof.

An electric light bulb, generally designated by the numeral I8, is removably mounted in the opening I5 of the casing il. This light bulb comprises hermetically, permanently sealed together glass lens and reflector portions I9 and 20; respectively, which envelopes afilament ZI. The reflector portion 2li has a reflecting finish 20' on its internal surface. Formed at the region of the 4 junction of the lens and reflector portions i9 and 20, which comprises the part of bulb IB of maximum diameter, is a rirn 22 having a forward portion which conforms in curvature to the rounded flange IB of the casing M. The enlarged diameterprovided by the cut-away portions of the flange I6 accommodate edgewise insertion of the bulb IB into the interior of the casing I4, wherein it may be turned to bring it to the position illustrated in Fig. 1 in order to bring the rim 22 into engagement with the flange I6.

The electric light bulb I8 is yieldably held against inward movement relative to the casing I4 by resilient sheet metal strips 23 which are-secured to the casing I4 and which yieldably bear against the external side of the reflector portion 20 of the bulb I8. Two or more of these resilient strips 23 are preferably provided and so located as not to interfere with the removal and replacement of the lamp I8. The lamp I8 may be removed from the casing -by urging it inwardly thereof until vthe rim 22 is separated from the flange I6 sufficiently to enable turning of the lamp bulb so that it may be moved outwardly of the casing in an edge-wise direction.

The casing` is releasably held in a selected position of adjustment by a plate 24 which is swingably mounted on the housing L0 by one or more screws 25. as illustrated in Fig. \1. The screw 25 55 flector 1n an opening 30 in the plate 24 and having an external head portion 3| located externally of the housing I0 and accessible from the exterior thereof. When the plate 24 is released the casing I4 and light bulb I8 carried thereby may be adjustably varied in position to direct the light beam movement of the ing I0 being of a being produced at, the front of the lamp.

'I'he lamp I8 is provided with a pair of terminalposts 32 the Wires with the terminal posts of the bulb While the latter is held externally of the casing I 4.` In a lamp of this character the lens and reportions of the bulb are held in fixed relationship with respect to each other and with re spect to the filament 2I under all conditions and the bulb may be properly positioned and securely held in selected positions of adjustment, in order to suitably direct a beam of light from the lamp, by the casing I4 which has a iiange surface of substantial extent in contact with the bulb.

In the form of the invention illustrated in Fig.

4, all parts of the lamp structure with the exception of the flange I6 and bead 22' of the bulb are substantially identical to those described in connection with Figs. l to 3. The ilange I8 of the 'able resiliently yieldable plate located opposite edge-wise insertion of the latter into the interior of the casing, after which it may be rotated to its normal position.

Neither the ilange of the casing I4 nor the rim 22 of the light bulb I8 necessarily has to be cut away if the casing and its ange are made of suitand deformable sheet metal. If the casing and iiange comprises yieldable and deformable sheet metal, then the flange I 6 thereof may be deformed by squeezing the open side of the casing into generally elliptical shape to accommodate insertion of the bulb thereinto.

In a motor vehicle it is sometimes desirable to employ a pair of headlights of different sizes, one and the other for low beam operation. When this is desired, a smaller light bulb 38. of substantially identical construction may be mounted in the same manner as the bulb I8.

Although but several specific embodiments of the invention are herein shown and described, it Will be understood that various changes in the size, shape and arrangement of. parts may be made without departing from the spirit of my invention.

What I claim is:

anchoring member against clamping said plate to ysaid housing, and releasable means for urging said plate against said casing to releasably hold said casing in an adjusted position, said releasable means comprising a screw extending through said aperture of said front portion of said housing having a head located external-ly of the latter and a shank portion threaded in an aperture of said from said plate support.

JOHN B. DICKSON. 

